GMC 4000 Series Service Manual page 466

INSTALLATION
1. Bolt slave cylinder assem bly to engine
(fig. 15).
2. Adjust slave cylinder push rod clearance
as outlined in this section under " Slave Cylinder
Clutch Type
GM (11-Inch Single Disc)
Borg & Beck (11-Inch Single D i s c ) .................................................305E
Borg & Beck (12-Inch Single D i s c ) .................................................292
Lipe-Rollway (12-Inch Single D i s c ) .................................................305C, 305E, DH478
Long (12-Inch Single Disc)
Lipe-Rollway (13-Inch Single D i s c ) .................................................305C, 351M, DH478
Long (13-Inch Single Disc)
IMPORTANT: Whenever clutch components require replacement, use only genuine General
Motors Parts or equivalent to assure maximum clutch performance and life.
CLUTCH REMOVAL
NOTE: Following removal procedures apply
to all vehicles with exceptions as indicated.
1. Remove transm ission assembly as outlined
in " TRANSMISSION ON-VEHICLE SERVICE OP­
ERATIONS" (SEC. 7B).
2. Remove clutch release bearing and support
assem bly from clutch release fork.
3. Disengage clutch
spring from end of fork.
4. Secure slave cylinder push rod and push
rod wedge to slave cylinder.
IMPORTANT: Do not lose wedge.
5. Remove clutch release fork from ball stud
by prying it away from the ball with a screwdriver
until it snaps loose from the ball.
NOTE: Some difficulty may be encountered
when removing the clutch release fork from the
ball stud. This condition could be the result of in­
sufficient clearance between the release fork and
the clutch cover. If the fork cannot be pried from
ball stud, remove the ball stud and spacer (when
used) from clutch housing, then if necessary, sep-
erate the fork from stud after the assembly is
removed.
6. Install aligning tool or an old transmission
main drive gear into the hub of the clutch driven
G M C S E R V I C E M A N U A L
SECTION 7E
Q U it c k e i.
CLUTCH APPLICATION CHART
...................................................................250
......................................................... ......305C, 305E, DH478
......................................................... ......305C, 351M, DH478
CLUTCH REPLACEMENT
release fork return
Push Rod Check and Adjustment.''
3. Attach hydraulic line to slave cylinder
and bleed air from system at slave cylinder bleed
fitting. See " Bleeding Hydraulic System" as de­
scribed previously.
Engine Application
disc assembly, to support the clutch components
during removal.
IMPORTANT: To facilitate removal of the
Long or Borg and Beck clutch cover assem blies,
install three hardwood wedges between the release
levers and cover as shown in figure 1.
On Lipe-Rollway clutches, install three flat
washers and hold-down bolts as shown in figure 2.
7. Mark clutch cover in relation to engine
flywheel to assure original position when reas­
sembled later if either part is to be reused.
8. Loosen the cover bolts alternately one turn
at a time to avoid creating undue str esses in the
clutch cover.
NOTE: It is most important that the cover
bolts be loosened one turn at a time on the GM
11-inch clutch (used on vehicles equipped with In-
Line engine).
9. Remove aligning
remove driven disc and cover assembly from
flywheel.
NOTE: If frame crossmember interferes
with disc and cover removal, force the bottom of
cover rearward and at the same time push cover
upward slightly. This will allow the disc to drop
down before the cover.
Sec. 7E
Page 455
CLUTCHES
tool, then carefully